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The potential of the two-stroke engine has become more and more subject to increasing research work trying to optimise the power-weight ratio as well as the pollutant emissions, especially with the development of high efficient direct injection systems. Doubtless is the scavenging process of the two-stroke engine a most complex and troublesome problem with the numerical simulation or design of new developments. Since the proposal of the perfect mixing model of HOPKINS in 1914 lots of different models have been offered to draw conclusions about the quality of the scavenging process. These may be classified into 3 main categories, the single zone, the multi zone and the fluid mechanical models, while precision and expenditure are increasing dramatically in this order. Every category serves a special purpose. By using single zone models, a simple and handsome way is offered to collect information about the trend behaviour of an engine.